Remove copilot-requests feature flag from autoloop

The copilot-requests permission isn't enabled on this repo, causing
every workflow run to fail with "The permission 'copilot-requests'
is not allowed".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mrjf

.github/workflows/autoloop.lock.yml

@@ -119,8 +119,6 @@ steps:
 source: githubnext/autoloop
 engine: copilot
 
-features:
-  copilot-requests: true
 ---
 
 # Autoloop